Results are reported of studies of the effect of ion implantation of aluminum, argon and nitrogen on the electrochemical properties of ferritic steel. It is shown that ion implantation increases the resistance of steel to anodic dissolution and pitting. The thickness of the layer with altered electrochemical properties was several nanometers. The improvement in the corrosion resistance of the steel is connected with a change in the crystal structure of the surface layers or with radiation-induced adsorption of hydrocarbons.